Rockwell Automation 1756-SYNCH ControlLogix SynchLink Module User Manual - Manual (Page 33)

Publication 1756-UM521C-EN-P - July 2004
SynchLink Module Features 3-5
Use Last Configuration When Connection to Owner-Controller
Closes - For Module’s Using Firmware Revision 2.18 or Greater
With firmware revision 2.18 or greater, the 1756-SYNCH module can
continue to operate, using its last configuration, when the module’s
connection to the owner-controller closes.
Module Features That Can
Be Configured The following SynchLink module features are configurable via
RSLogix 5000:
• Communications Format
• Electronic Keying
• Requested Packet Interval
• SynchLink Transmitted Axes
• Transmitted Direct Words
• CST and SynchLink Mastership
Each of these features is described in this section, including
information on which RSLogix 5000 configuration screen should be
used to configure the feature. For an overview of the entire
configuration process, see Chapter 5, Configuring the SynchLink Module.
Communications Format
The communications format defines the connection between the
owner-controller and the module (i.e. determines what type of data is
Table 3.2
If the 1756-SYNCH module is used in
this scenario: and the owner-controller closes its
connection to the 1756-SYNCH module,
such as for one of the following reasons: The 1756-SYNCH behaves as follows:
• The 1756-SYNCH module is located
in a chassis with two ControlLogix
controllers.
• The 1756-SYNCH module is the time
master for the local chassis.
• One of the ControlLogix controllers is
the 1756-SYNCH module’s
owner-controller.
• The other ControlLogix controller is
controlling motion based on the CST
set by the 1756-SYNCH module.
• The controller is downloading a new
project.
• The controller is saving its NVS.
• The controller is restoring its NVS.
• The controller is updating the module’s
firmware.
• The controller is removed from
the chassis.
The module continues to act as time
master for the local chassis, operating as
directed by its most recent configuration.
The 1756-SYNCH module’s behavior only
changes if the owner-controller reopens
the connection to the module and
reconfigures the module.